[CI] Drop ascend scheduler from test

[wangxiyuan]

Drop ascend scheduler from test

• vLLM version: v0.11.2
• vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

[github-actions]

👋 Hi! Thank you for contributing to the vLLM Ascend project. The following points will speed up your PR merge:‌‌

• A PR should do only one thing, smaller PRs enable faster reviews.
• Every PR should include unit tests and end-to-end tests ‌to ensure it works and is not broken by other future PRs.
• Write the commit message by fulfilling the PR description to help reviewer and future developers understand.

If CI fails, you can run linting and testing checks locally according Contributing and Testing.

[gemini-code-assist]

Code Review

This pull request removes all tests related to the AscendScheduler, including the entire E2E test file and several unit tests. However, the implementation code for the AscendScheduler and its configuration (AscendSchedulerConfig) still exists in the codebase (e.g., in vllm_ascend/ascend_config.py, vllm_ascend/platform.py, and vllm_ascend/core/schedule_config.py). Leaving this feature code without any tests is a critical issue, as it becomes dead code that is hard to maintain and can lead to silent breakages. If the AscendScheduler is being deprecated, its implementation should be removed along with the tests. If it is not being deprecated, the tests should be restored or replaced.

[MengqingCao]

LGTM if all ci pass

[wangxiyuan]

@MengqingCao No need to run e2e IMO